While going to Everest Region Trekking in Nepal that is an important to fly Lukla from Kathmandu but Kathmandu to Lukla flight is not sure flight therefore in case of flight cancellation Most of the Everest Region Tourist Trekkers drive From kathmandu to Phaplu Salleri. This is the best option and possibilities for driving.It takes one day to drive from Kathmandu to Phaplu Salleri and next day you can drive to Thamdanda then you can walk for your Everest Region Trekking.And from Lukla also in case of flight Cancellation Tourists walk to Thamdanda and drive to Kathmandu through the Phaplu Salleri.
https://enjoynepaltreks.com/blog/kathmandu-to-phaplu-salleri-jeep/